22.2

Question 1

numerous reproductive isolating mechanisms

Answer 1

pre-zygotic isolation mechanisms:
-ecological isolation
-behavioral isolation
-temporal isolation
-mechanical isolation
-prevention of gamete fusion
post-zygotic isolation mechanisms:
-hybrid inviability or infertility

Question 1

reproductive isolation

Answer 1

indivudals either will not mate with each other, cannot mate with each other, or produce offspring

Question 2

ecological isolation

Answer 2

species that occur in the same area may use different areas of the environment and not encounter each other frequently, if at all

Question 3

behavioral isolation

Answer 3

differences in courtship rituals and mating calls prevent different species from accidentally mating

Question 4

temporal isolation

Answer 4

species capable of hybridizing in the laboratory may not hybridize in nature because they have different growing or breeding seasons

Question 5

mechanical isolation

Answer 5

structural differences in the reproductive systems of some plant and animal species prevent mating from occuring

Question 6

prevention of gamete fusion

Answer 6

mechanisms that prevent fusion are important for animal species that shed gametes into water and plants that rely on wind or pollinators to transfer pollen

Question 7

post-zygotic isolating mechanisms

Answer 7

if mating does occur despite factors, there are mechanims that prevent fertile offsprin from being produced
hybrid inviability
hydrid infertility

Question 8

hybrid inviability

Answer 8

in some situation, the embryos will not develop properly and may not be born at all or die shortly afterwards

Question 9

hybrid infertility

Answer 9

if the hybrids do survie they are often incapable of producing offspring